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The electronic spectra and the photochemistry of the uranyl complexes UO2 (salophen) and UO 2  (oxinate) 2  with H 2 salophen = N,N´-bis(salicylidene)-o-phenylenediamine and oxine = 8- hydroxyquinoline were studied. The excited state behavior of both complexes is determined by a low-energy salophen 2-  / oxinate -  to U(VI) ligand-to-metal charge transfer (LMCT) state which is not luminescent but can be reactive. In the case of UO 2  (oxinate) 2  the photolysis leads to the formation of free oxine with ϕ = 3.6 x 10 -3  at λ irr  = 366 nm in CHCl 3 . It is suggested that various redox processes with the participation of the solvent are involved in product formation. UO 2  (salophen) is not light sensitive since the primary electron transfer is followed by recombination which is facilitated by the rigid UO 2 (salophen) structure.

Excited State Behavior of Uranyl Complexes with Salophen and Oxine as Chromophoric Ligands